Sending AT command from xbee pro to read the data from device

I am new to serial communications using Labview. 

I am having trouble with starting up the project, where I have to design the software that involves XBee pro module.

I need to send the READ command to read the data from a device. Then the software should go to the AT command mode (we enter the AT command mode by entering +++)

Then I need to read the energy level of the device by entering the command: ATED. The software should continuously read the energy level every 30 seconds, which will be displayed on the front panel. 

I am not sure where to start the software from. i.e. how to enter the Read command and then the AT command. 

I am hoping someone can suggest how to start this.

Thanks  in advance.